CVE-2024-25048: IBM MQ Appliance Buffer Overflow Flaw

CVE-2024-25048 Overview

CVE-2024-25048 is a heap-based buffer overflow vulnerability affecting IBM MQ Appliance 9.3 Continuous Delivery (CD) and Long Term Support (LTS) releases. The flaw stems from improper bounds checking in the appliance software. A remote authenticated attacker can overflow a heap buffer to execute arbitrary code or crash the server. IBM tracks the issue as X-Force ID 283137 and classifies it under [CWE-122: Heap-based Buffer Overflow]. The vulnerability requires valid credentials but no user interaction, and impacts confidentiality, integrity, and availability.

Critical Impact
A successful exploit allows arbitrary code execution on the IBM MQ Appliance, potentially compromising message queues and downstream enterprise messaging workloads.

Affected Products

IBM MQ Appliance 9.3 LTS
IBM MQ Appliance 9.3 CD (Continuous Delivery)
Component: ibm:mq_appliance

Discovery Timeline

2024-04-27 - CVE-2024-25048 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-25048

Vulnerability Analysis

CVE-2024-25048 is a heap-based buffer overflow in IBM MQ Appliance. The appliance fails to validate the size of attacker-controlled input before copying it into a heap-allocated buffer. When the input exceeds the buffer's capacity, adjacent heap memory is overwritten, corrupting control structures and application data.

The vulnerability requires network access and low-privilege authentication. Attack complexity is high because exploitation depends on heap layout and successful control of memory metadata. A successful attacker can execute arbitrary code in the context of the MQ Appliance process, or trigger a crash that disrupts messaging services.

IBM MQ Appliance serves as messaging middleware for enterprise integration. Compromise of the appliance can expose in-transit business messages, credentials, and configuration data across connected systems.

Root Cause

The root cause is improper bounds checking [CWE-122] in the code path that handles incoming data on the appliance. The affected routine copies input into a fixed-size heap buffer without validating the source length against the destination capacity.

Attack Vector

Exploitation requires an attacker with valid credentials on the appliance and network reachability to the MQ service. The attacker submits a crafted request that triggers the vulnerable copy operation, overflowing the heap buffer. Since no user interaction is required, exploitation can be scripted against any reachable, authenticated endpoint.

No verified proof-of-concept code is publicly available. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the IBM X-Force Vulnerability #283137 entry for additional technical detail.

Detection Methods for CVE-2024-25048

Indicators of Compromise

Unexpected crashes, restarts, or core dumps of MQ Appliance processes
Abnormally large or malformed messages sent to MQ listener ports from authenticated sessions
New or unusual outbound network connections initiated by the appliance following authenticated activity
Unexplained changes to queue manager configuration or message routing

Detection Strategies

Inventory all IBM MQ Appliance instances and confirm firmware version against the fixed release noted in the IBM support advisory
Enable authentication and activity auditing on the MQ Appliance and forward logs to a centralized SIEM
Alert on repeated authentication failures followed by successful logins from the same source, which may indicate credential compromise preceding exploitation
Correlate appliance process termination events with preceding authenticated client sessions to identify suspected exploit attempts

Monitoring Recommendations

Monitor MQ Appliance system logs for segmentation faults, heap corruption messages, and unexpected service restarts
Track message size distributions on MQ listener ports and alert on statistical outliers
Review privileged and administrative account usage on the appliance for unauthorized sessions
Ingest appliance telemetry into a data lake for retrospective hunting against known exploitation patterns

How to Mitigate CVE-2024-25048

Immediate Actions Required

Apply the fix referenced in the IBM Support advisory for CVE-2024-25048 to all IBM MQ Appliance 9.3 CD and LTS instances
Restrict network access to the MQ Appliance management and messaging interfaces using firewall rules and network segmentation
Rotate credentials for any account with access to the MQ Appliance, and enforce least privilege on MQ authorization records
Review recent authenticated sessions and administrative activity for indicators of exploitation

Patch Information

IBM has published a security bulletin and patch guidance at the IBM Support Page for Patch. Administrators should apply the fix pack identified for their specific 9.3 CD or LTS release. Additional vulnerability metadata is available on the IBM X-Force entry.

Workarounds

Limit MQ Appliance access to trusted management networks and jump hosts only
Enforce strong authentication and multi-factor access for administrators of upstream systems that connect to the appliance
Disable unused channels, listeners, and services on the MQ Appliance to reduce the exposed attack surface
Where patching is delayed, apply strict channel authentication records (CHLAUTH) to constrain which users and IP ranges can connect

bash

# Example: restrict MQ channel access to a trusted admin subnet
# Run inside runmqsc against the affected queue manager
SET CHLAUTH('*') TYPE(ADDRESSMAP) ADDRESS('*') USERSRC(NOACCESS) ACTION(REPLACE)
SET CHLAUTH('ADMIN.SVRCONN') TYPE(ADDRESSMAP) ADDRESS('10.0.10.0/24') USERSRC(CHANNEL) ACTION(REPLACE)
REFRESH SECURITY TYPE(CONNAUTH)